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TAPI 3.1 supports two classes of service providers: telephony and media. Telephony service providers (TSPs) provide implementation of telephony signaling and connection control features, and media service providers (MSPs) provide access to and control the media content associated with those connections, such as the audio and video streams of a videoconference. For more information about media service providers in TAPI, see Telephony Integration and Conferencing in the Internetworking Guide of the Microsoft Windows 2000 Server Resource Kit. A telephony service provider (TSP) is a dynamic-link library (DLL) that supports communications over a telephone network to one or more specific hardware devices through a set of exported service functions. The service provider responds to telephony requests sent by TAPI and completes the basic tasks necessary to communicate over the telephone network. In this way, the service provider, in conjunction with TAPI, shields applications from the servicedependent and technology-dependent details of telephone network communication. The installation tool for a service provider registers the application with TAPI and associates that service provider with the hardware devices it supports. Multiple service providers can share the same device for example, the H.323 TSP and Multicast Conference TSP can both use the same network adapter. Existing applications can be associated with new telephony devices, or the function of existing devices can be extended by using the development and implementation of new service providers. Table 26-3 lists the telephony and media service providers included with Windows XP Professional.

Table 26-3

Under normal circumstances, Windows XP automatically assigns system resources to hardware devices, such as interrupt request (IRQ) numbers and memory port ranges. There is nothing for you to do on the Resources tab if there are no problems with resource assignments (which there rarely are). However, if a conflict exists, you can manually assign resources to try to resolve the problem.

Function Provide voice and video services over data networks using the H.323 protocol. Support calling conventional phones through IP-PSTN gateways and Internet audio/video calls. Provide multiple-user conference support over intranets and the Internet. Permits TAPI applications to access wide area network (WAN) devices, such as ISDN modems and Asynchronous Transfer Mode (ATM) devices, using a standard Network Driver Interface Specification (NDIS) 5.0 interface.

Multicast Conference TAPI Service Provider Multicast Conference Media Service Provider NDIS Proxy TAPI Service Provider

26:

Once your modem or broadband hardware is installed and configured correctly, your next step is to create an Internet connection. To create the new connection, you simply need to use the New Connection Wizard. Normally, you ll use your ISP s setup CD for both broadband and dial-up connections, so it is important that you read the ISP s documentation and perform the steps as required. If you need to establish a dial-up or broadband connection for an existing account or if you want to use the manual approach, the New Connection Wizard can easily guide you through the process. See the following steps for details:

Table 26-3

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Function Provides TAPI support for NDIS 4 WAN drivers. Provide device abstraction and TAPI support for a wide variety of modem devices. The Unimodem 5 MSP is used when using full-duplex voice modems. Used with any TSP that provides an audio wave driver. For example, when Unimodem 5 TSP is used with half-duplex voice modems, Wave MSP is used.

Service Provider TAPI Kernel-Mode Service Provider Unimodem 5 Telephony Service Provider Unimodem 5 Media Service Provider Wave Media Service Provider

1 Open Network Connections. From the Windows XP Start menu, choose Connect To, Show All Connections. From the Classic Start menu, choose Settings, Network Connections. Connection link.

Additional service providers can be obtained from hardware vendors for use with their hardware and existing telephony applications, such as a PBX hardware solution. Note

Quality of Service (QoS) refers to a combination of mechanisms that cooperatively provide a specific quality level to application traffic crossing a network or multiple, disparate networks. QoS helps ensure a constant, reliable, steady data stream when using real-time communications, such as IP telephony and video conferencing, over packet-based networks.